Facebook 

What is face book : Facebook is a online socializing network service

Why was it created :Mark Zuckerberg created Facebook in 2004 at Harvard to have an online place for all his classmates to connect. It then was spread to other college campuses. In 2005 it opened to high schools and in 2006 it became open to all users. It has since become the most popular social networking site in the world with over 400 million users.

registration:   Users must register before using the site, after which they may create a personal profile, add other users as friends, and exchange messages, including automatic notifications when they update their profile. Additionally, users may join common-interest user groups, organized by workplace, school or college, or other characteristics, and categorize their friends into lists such as “People From Work” or “Close Friends”. As of September 2012, Facebook has over one billion active users. According to a May 2011 Consumer Reports survey, there are 7.5 million children under 13 with accounts and 5 million under 10, violating the site’s terms of service.

Initial public offering:  Facebook filed their S1 document with the Securities and Exchange Commission (SEC) on February 1, 2012. The company filed for a US$5 billion initial public offering (IPO), making it one of the biggest in tech history and the biggest in Internet history. Facebook valued its stock at $38 a share, pricing the company at $104 billion, the largest valuation to date for a newly public company. The IPO raised $16 billion, making it the third largest in U.S. history.

Revenue:

Most of Facebook’s revenue comes from advertising.

Facebook generally has a lower clickthrough rate (CTR) for advertisements than most major Web sites. According to BusinessWeek.com, banner advertisements on Facebook have generally received one-fifth the number of clicks compared to those on the Web as a whole,although specific comparisons can reveal a much larger disparity. For example, while Google users click on the first advertisement for search results an average of 8% of the time (80,000 clicks for every one million searches), Facebook’s users click on advertisements an average of 0.04% of the time (400 clicks for every one million pages).